Anderson failed for a number of reasons, but in his defence, I'd attribute his injuries to his lack of growth. He had many good games, he did and does have a lot of talent, but that knee injury against Wolves was a horror, and really set him back. Beyond that, it's been niggle after niggle. I don't doubt his much - argued indiscipline, however I simply can't believe that Sir Alex and our team of medical professionals would allow that kind of thing to go on for so long. Rooney, for example, has always irritated Sir Alex because of his well - known indiscipline, that's no secret.
I don't think rotation did him any favours. He'd regularly find himself dropped for a 36 year old Scholes after a good outing, which was never of benefit. And then there's his actual fitness. I could be wrong, but I'm certain I read that he had the lowest Co2/O2 levels at the club upon arrival, which would explain his poor lack of stamina.
Then there's the probable fact that he just didn't take it all that seriously, which he himself has admitted. I like the guy, and I know there's still a good player in there, but it's a sorry story when you consider he promised so much.